CN101110856A - Testing apparatus for ringing current breadth - Google Patents
Testing apparatus for ringing current breadth Download PDFInfo
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- CN101110856A CN101110856A CNA2006100988755A CN200610098875A CN101110856A CN 101110856 A CN101110856 A CN 101110856A CN A2006100988755 A CNA2006100988755 A CN A2006100988755A CN 200610098875 A CN200610098875 A CN 200610098875A CN 101110856 A CN101110856 A CN 101110856A
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Abstract
The present invention discloses a ring current amplitude value detection device, which comprises a blocking wave filtering module, a ratio attenuation module, a peak value extraction module with a reset function, a reference voltage module and a voltage comparison module. The peak value extraction module with a reset function is applied to transform the signal into direct current level, the direct current level value get is equal to the signal peak value, and the direct current level is output to the voltage comparison module; and simultaneously the module provides a reset input terminal; the reference voltage module is applied to generate the reference voltage, and to output the reference voltage signal to the voltage comparison module; the voltage comparison module is applied to compare the reference voltage and the direct current level of the ring current process by the backing stage, and the ring current amplitude value result is got. The present invention can judge that whether the ring current amplitude value is in the range accurately, and the structure is simple, the cost is inexpensive, the circuit is reliable, and the controlling and the result reading are very convenient.
Description
Technical field
The present invention relates to a kind of device of telephonic communication technical field, what be specifically related to is a kind of device that detects ringing current breadth.
Background technology
Ringing signal commonly used is the sine wave of DC component of having superposeed, and its frequency and amplitude all need meet certain requirements.In general, ringing-current is to deliver on the analog line through intermediate circuit after being produced by the ringing-current module, or user interface circuit is directly produced by-48V power supply.Therefore, the meaning that ringing current breadth detects being not only in order to guarantee the quality in ringing-current source itself, also is simultaneously the indirectly testing to middle circuit.Such as, there are ringing-current line and other line short trouble in exchange to be measured or the access device, just may cause ringing current breadth to reduce.So,, need a kind of method simply fast and judge whether the ringing current breadth on the analog line is normal exchange and access device being carried out basic functions when test.
Among Chinese patent CN200320113782 " loop trunks interface arrangement " and the Chinese patent CN02272770 " the switchable interface circuit of user/relaying ", the ringing-current detecting unit is arranged all.The basic principle of its implementation all is that the optocoupler input is serially connected in the analog line, if there is ringing-current then can make periodically conducting of optocoupler, detects ringing-current according to this and has or not.Because the condition of optocoupler conducting is not strict, unless great changes have taken place for ringing current breadth, circuit generally still can be working properly, therefore can not satisfy the functional test needs of analog line well.
Among the Chinese patent CN99246105 " ringing current power source module test device ", proposed detailed method of testing, can test out the various performance index of ringing-current ringing-current.But this method needs special instrument, and as digital universal instrument, distortion factor instrument etc., cost is higher, is suitable for the test to power module itself, and is not suitable for the functional test to analog line and intermediate circuit.
Therefore prior art has yet to be improved and developed.
Summary of the invention
The object of the present invention is to provide a kind of testing apparatus for ringing current breadth, detect, proposed a kind of simple and reliable ringing-current checkout gear at the analog line ringing current breadth.
Technical scheme of the present invention comprises:
A kind of testing apparatus for ringing current breadth wherein, comprises with lower module: every peak extraction module, reference voltage module and the voltage comparison module of straight filtration module, ratio attenuation module, band reset function;
Describedly be used for the DC component and the high frequency clutter of input ringing-current are carried out filtering, and export signal to described ratio attenuation module every straight filtration module;
Described ratio attenuation module is used for ringing current breadth scaled, and voltage waveform remains unchanged, and the gained signal is exported to the peak extraction module of described band reset function;
The peak extraction module of described band reset function is used for conversion of signals is become DC level, and the DC level value of gained equals signal peak, and exports DC level to described voltage comparison module; This module provides a RESET input simultaneously;
Described reference voltage module is used to produce reference voltage, and this reference voltage signal is outputed to described voltage comparison module;
Described voltage comparison module is used for reference voltage is compared with the DC level of ringing-current after prime is handled, and obtains the ringing current breadth testing result.
Described device, wherein, the peak extraction module of described band reset function comprises operational amplifier, diode, triode, peripheral resistance and capacitor; Described diode inserts the negative-feedback circuit of described operational amplifier, and described capacitor and described triode bypass are connected the output of described operational amplifier, and described capacitor is arranged on the collector electrode of described triode, and ground connection; The base stage of described triode connects the reset signal input.
Described device, wherein, the input signal of the peak extraction module of described band reset function comes from the ratio attenuation module, and in this input signal rising edge, described operational amplifier constitutes voltage follower, to described capacitor charging; And in this input signal decline process, the voltage on the described capacitor remains unchanged.
Described device, wherein, described reset signal end is that high level is effective, described triode conducting this moment makes described capacitor by peripheral resistance and the discharge of described triode.
Described device, wherein, described reset signal end is before carrying out once new test, and reset signal is one scheduled time of high level, makes original electric charge release on the capacitor; And after beginning test, reset signal remains low.
Described device, wherein, described reference voltage module is made up of voltage reference source, current-limiting resistor.
A kind of testing apparatus for ringing current breadth provided by the present invention, compared with prior art, apparatus of the present invention can be judged ringing current breadth whether in the scope of setting more exactly, and simple in structure, with low cost, and circuit is reliable, and control and result read easily; Therefore can be used to detect ringing current breadth fast roughly and whether meet the demands, reflect faults such as Analog Subscriber Line Board internal circuit short circuit indirectly.
Description of drawings
Fig. 1 is the principle schematic of apparatus of the present invention, is the part and the annexation of this device in the frame of broken lines wherein;
Fig. 2 is peak extraction module (module C) the circuit theory schematic diagram of band reset function of the present invention;
Fig. 3 is reference voltage module (module D) the circuit theory schematic diagram of apparatus of the present invention;
Fig. 4 is voltage comparison module (module E) the circuit theory schematic diagram of apparatus of the present invention.
Embodiment
Below in conjunction with accompanying drawing, will be described in more detail each preferred embodiment of the present invention.
Testing apparatus for ringing current breadth of the present invention comprises as shown in Figure 1 with lower module: every peak extraction module C, reference voltage module D, the voltage comparison module E of straight filtration module A, ratio attenuation module B, band reset function.
Of the present inventionly finish DC component and the high frequency clutter function of carrying out filtering of input in the ringing-current, and export signal to ratio attenuation module B every straight filtration module A; Described ratio attenuation module B finishes the function that ringing current breadth is scaled, and voltage waveform remains unchanged, and the gained signal is exported to the peak extraction module C of band reset function; The peak extraction module C of described band reset function finishes the function that conversion of signals is become DC level, and the DC level value of gained equals signal peak, and exports DC level to voltage comparison module E, and this module provides a RESET input simultaneously; Described reference voltage module D finishes the function that reference voltage produces, and this voltage signal is outputed to voltage comparison module E; Described voltage comparison module E finishes the function that reference voltage is compared with the DC level of ringing-current after prime is handled, and obtains the ringing current breadth testing result.
The two wires input is simulated at first receiving every straight filtration module A in the device of the present invention, described simulation two wires is input as analog line (two wires), be RING line and TIP line, the TIP line links to each other with the ground of apparatus of the present invention, and the RING end then at first is input to every straight filtration module A.
Ringing signal on the described analog line generally is superimposed with DC component, has some high frequency clutters in addition.Should in straight filtration module, carry out the filtering processing through of the present invention, output to described ratio attenuation module B not comprising ringing signal DC component, that clutter is less to DC component and high frequency clutter.
Described specific implementation every straight filtration module A can adopt multiple mode, and prior art comparative maturity, does not repeat them here.
The setting of ratio attenuation module B of the present invention:, be unfavorable for direct processing because ringing current breadth is generally bigger.Ratio attenuation module B will decay in proportion every the ringing-current of straight filtration module A output, so that the less ac voltage signal of measuring of amplitude, and the waveform of voltage remains unchanged; Then this signal is delivered to the peak extraction module C of band reset function.
The specific implementation technology of described ratio attenuation module B is comparative maturity, as the mode realization of adopting electric resistance partial pressure etc., does not repeat them here.
Realization for the peak extraction module C of band reset function of the present invention, the function of the peak extraction module C of this band reset function is to produce a direct voltage, and its value equals the peak value of ringing-current gained signal after handling every straight filtration module A, ratio attenuation module B.The peak extraction module C of this band reset function also has reset function in addition, can eliminate the influence of historical signal to the current demand signal testing result.The direct voltage that the peak extraction module C of this band reset function obtains outputs to described voltage comparison module E.
Be a kind of implementation of the peak extraction module C of band reset function as shown in Figure 2, constitute by operational amplifier D1, diode VD1, triode T1, resistor R 1, R2 and capacitor C1, described diode VD1 inserts the negative-feedback circuit of described operational amplifier D1, described capacitor C1 and described triode bypass are connected the output of described operational amplifier D1, and described capacitor C1 is arranged on the collector electrode of described triode T1, and ground connection; The base stage of described triode T1 connects the RESET signal input part.
One input signal S
1Come from ratio attenuation module B, at S
1In the signal rising edge, operational amplifier D1 has constituted voltage follower, to capacitor C 1 charging; And at S
1In the decline process, because VD1 has blocked the discharge path of C1, so the voltage on the C1 remains unchanged.Like this, the voltage on the capacitor C 1 is direct current just, and its value is approximately equal to ac voltage signal S
1Peak value, be designated as Vp.The RESET end is a reset terminal, and high level is effective.Triode T1 conducting when RESET is high level makes capacitor C 1 by resistance R 2 and triode T1 discharge.Before carrying out once new test, RESET should be a bit of time of high level, makes original electric charge release on the capacitor C 1.And after beginning test, RESET should remain low.
The function of reference voltage module D of the present invention is the voltage that produces a benchmark, is used for comparing with the treated signal afterwards of ringing-current, and the value of described reference voltage is relevant with the threshold setting that ringing current breadth detects.
Be a kind of implementation of reference voltage module D of the present invention as shown in Figure 3, form by voltage reference source D2, current-limiting resistor R3.That wherein D2 selects for use is the voltage reference source LM4040AIM of NS company, and the reference voltage of output is 2.5V, is designated as V
RCertainly, the reference voltage of other amplitude also can be selected other device for use if desired, perhaps obtains with electric resistance partial pressure.
Voltage comparison module E of the present invention has two input signals, and one comes from the peak extraction module C that is with reset function, is the direct current signal of ringing-current through obtaining after straight filtering, ratio decay, peak extraction; Another comes from reference voltage module D, is the voltage reference signal of a standard.Among this voltage comparison module E these two signals are compared, draw the testing result of ringing current breadth.This testing result is exported by a level signal.
Be a kind of implementation of voltage comparison module as shown in Figure 4, two input signals are respectively the voltage V that voltage signal Vp that the peak extraction module C of band reset function obtains and reference voltage module D obtain
RVoltage comparison module E mainly is made up of than chip voltage ratio, as the integrated voltage comparator LM293 of FIRECHILD company.Increasing R7 is the hysteresis comparison strategy that adopts for output is stablized, and general value is bigger.If common comparator can meet the demands, also can not adopt this resistance.The outputs level signals of voltage comparison module E has characterized the testing result of ringing current breadth.
When selecting concrete circuit parameter, at first to determine a threshold value.According to this threshold value, determine the parameter of ratio attenuator circuit and reference voltage.Whether too little, then threshold value should be set at the lower limit (removing DC component) of the ringing-current peak value that can satisfy the demands if detecting ringing current breadth if desired.Such as, the peak value of customer requirements ringing-current after removing DC component can not be lower than 90V, and reference voltage is if select 2.5V, and the ratio attenuator circuit should be 2.5V/90V to the attenuation ratio of ringing-current so, promptly decays to 1/36.At this moment, if the ringing current breadth testing result is a high level, expression ringing current breadth deficiency; If the ringing current breadth testing result is a low level, the expression ringing current breadth meets the demands.
Test ringing current breadth if desired and whether surpass the upper limit, principle is a basically identical, is about to the upper limit (remove DC component) of threshold setting for the ringing-current peak value that can satisfy the demands, and counting circuit parameter according to this.This moment, the ringing current breadth testing result was a high level, and the expression ringing current breadth is normal; If the ringing current breadth testing result is a low level, the expression ringing current breadth is excessive.
To sum up, testing apparatus for ringing current breadth provided by the present invention can be judged ringing current breadth whether in the scope of setting more exactly, and simple in structure, with low cost, and circuit is reliable, and control and result read easily; Therefore can be used to detect ringing current breadth fast roughly and whether meet the demands, reflect faults such as Analog Subscriber Line Board internal circuit short circuit indirectly.
Should be understood that above-mentioned description at specific embodiment is comparatively detailed, can not therefore think the restriction to scope of patent protection of the present invention, scope of patent protection of the present invention should be as the criterion with claims.
Claims (6)
1. a testing apparatus for ringing current breadth is characterized in that, comprises with lower module: every peak extraction module, reference voltage module and the voltage comparison module of straight filtration module, ratio attenuation module, band reset function;
Describedly be used for the DC component and the high frequency clutter of input ringing-current are carried out filtering, and export signal to described ratio attenuation module every straight filtration module;
Described ratio attenuation module is used for ringing current breadth scaled, and voltage waveform remains unchanged, and the gained signal is exported to the peak extraction module of described band reset function;
The peak extraction module of described band reset function is used for conversion of signals is become DC level, and the DC level value of gained equals signal peak, and exports DC level to described voltage comparison module; This module provides a RESET input simultaneously;
Described reference voltage module is used to produce reference voltage, and this reference voltage signal is outputed to described voltage comparison module;
Described voltage comparison module is used for reference voltage is compared with the DC level of ringing-current after prime is handled, and obtains the ringing current breadth testing result.
2. device according to claim 1 is characterized in that, the peak extraction module of described band reset function comprises operational amplifier, diode, triode, peripheral resistance and capacitor; Described diode inserts the negative-feedback circuit of described operational amplifier, and described capacitor and described triode bypass are connected the output of described operational amplifier, and described capacitor is arranged on the collector electrode of described triode, and ground connection; The base stage of described triode connects the reset signal input.
3. device according to claim 2, it is characterized in that the input signal of the peak extraction module of described band reset function comes from the ratio attenuation module, in this input signal rising edge, described operational amplifier constitutes voltage follower, to described capacitor charging; And in this input signal decline process, the voltage on the described capacitor remains unchanged.
4. device according to claim 3 is characterized in that, described reset signal end is that high level is effective, and described triode conducting this moment makes described capacitor by peripheral resistance and the discharge of described triode.
5. device according to claim 4 is characterized in that, described reset signal end is before carrying out once new test, and reset signal is one scheduled time of high level, makes original electric charge release on the capacitor; And after beginning test, reset signal remains low.
6. device according to claim 1 is characterized in that, described reference voltage module is made up of voltage reference source, current-limiting resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200610098875A CN100579148C (en) | 2006-07-17 | 2006-07-17 | Testing apparatus for ringing current breadth |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200610098875A CN100579148C (en) | 2006-07-17 | 2006-07-17 | Testing apparatus for ringing current breadth |
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| Publication Number | Publication Date |
|---|---|
| CN101110856A true CN101110856A (en) | 2008-01-23 |
| CN100579148C CN100579148C (en) | 2010-01-06 |
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| CN200610098875A Active CN100579148C (en) | 2006-07-17 | 2006-07-17 | Testing apparatus for ringing current breadth |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105744103A (en) * | 2016-04-15 | 2016-07-06 | 天地（常州）自动化股份有限公司 | Voltage/current independent, continuous and adjustable signal device of direct current/ringing current |
| CN110045180A (en) * | 2019-05-14 | 2019-07-23 | 中南民族大学 | A kind of method and system being most worth measurement for waveform |
| CN112345812A (en) * | 2020-09-25 | 2021-02-09 | 华东光电集成器件研究所 | Amplifier signal amplitude-frequency detection circuit |
-
2006
- 2006-07-17 CN CN200610098875A patent/CN100579148C/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105744103A (en) * | 2016-04-15 | 2016-07-06 | 天地（常州）自动化股份有限公司 | Voltage/current independent, continuous and adjustable signal device of direct current/ringing current |
| CN110045180A (en) * | 2019-05-14 | 2019-07-23 | 中南民族大学 | A kind of method and system being most worth measurement for waveform |
| CN110045180B (en) * | 2019-05-14 | 2019-11-22 | 中南民族大学 | A kind of method and system being most worth measurement for waveform |
| CN112345812A (en) * | 2020-09-25 | 2021-02-09 | 华东光电集成器件研究所 | Amplifier signal amplitude-frequency detection circuit |
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| Publication number | Publication date |
|---|---|
| CN100579148C (en) | 2010-01-06 |
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